DE19920682A1 - Steam coating for spinning system with rectangular nozzles - Google Patents

Abstract

A method and device for the application of a vaporous mist to rectangular nozzles (2) and spinning systems fitted therewith for the production of polyamide filaments. The vapor is supplied via a coiled pipe (9) which is guided through the heating chamber of a spin-die manifold (1) and the vapor is heated to spinning temperature. Vapor outlet strips (11) are placed lengthwise, directly underneath the spin-die manifold (1). i.e. on the lower edge of the group of rectangular nozzles (2) between the spin-die manifold (1) and the after-heater (4). Said vapor outlet strips (11) are fitted with a simple labyrinth for homogenization of pressure. Initially, vapor enters in the middle of the group of rectangular nozzles and passes along the group of rectangular nozzles into a relatively wide distribution chamber which is open at the top. The vertical distribution chamber leads to a horizontal and very narrow dividing chamber which flows openly into the spinning chamber. The vapor then exits in the direction of the nozzles across a plurality of filaments. A vaporous mist is applied to the rear sides of the group of rectangular nozzles.

Description

The invention relates to steam coating in the production of polyamide Filaments, especially for rectangular spinnerets after bottom loading Concept and spinning systems equipped with it.

When spinning polyamides, especially PA6, escape during of the filament outlet from the spinneret monomers and oligomers in the form of unpleasant fumes that accumulate uncontrollably in the area can. To prevent this, these emissions are via suction nozzles that must be attached as close as possible to the spinning outlet. The function and the design of such suction nozzles are in DE 198 36 682.5 been made known. From DE 198 30 453.6 it is also known that superheated steam, which serves to moisten the polyamide filaments and Suction effect supports, at the same time also the wipe interval time Spinnerets are extended if they are blown directly with them.

Conventional devices that serve the aforementioned purposes, however, interfere again when cleaning or changing the nozzles. So z. B. one currently Get the usual nozzle coating so that the steam on the long side of a Rectangular nozzle package centrally on the side wall of the relevant nozzle package is blown, then in the gap between the nozzle package and nozzle shaft in the Spinning beam flows downwards and more or from a built-on baffle plate is deflected less evenly towards the spinning plate. This device is apart from the insufficient covering, for rectangular nozzle packages after the bottom loading concept cannot be used, nor can the solution for round spinnerets from the application DE 198 30 453.6, which due to the direct subsequent reheater and also conceptually eliminated.

So there is a demand for a functional, cleaning and user-friendly device for steam coating of rectangular nozzles and the solution according to the invention has the features of the claims.

The advantages of the new steam coating are the good temperature control of the Steam, the steam supply being carried out through a pipe coil through the Boiler chamber of the spinning beam is passed through to the steam up Bring spinning temperature. The steam outlet strips are advantageously direct under the spinning beam, i.e. on the lower edge of the final one Rectangular nozzle package, installed between the spinning beam and the reheater. This Steam outlet strips are with a simple labyrinth for pressure comparison moderation, which is particularly inexpensive to manufacture. The Steam enters first in the middle of the rectangular nozzle package and leaves in an upwardly open and relatively wide distribution space along the Rectangular nozzle package over. This vertical distribution space goes into one horizontal and very narrow gap space above that open into the spinning space flows. The steam then emerges broadly and evenly in the direction of the nozzle. This is done so effectively that there is no need for fogging from the front.

The detailed description of the method and the device for steam covering of rectangular nozzles and spinning systems equipped with them The production of polyamide filaments is now continued using drawings. The shows

Fig. 1 is a section in which the Dampfbeschleierung invention is installed through a spinning beam,

Fig. 2 in detail the steam coating in the assembled and

Fig. 3 in the disassembled state.

Fig. 1 shows an exemplary spin system. The cut goes through a spinning beam ( 1 ) with rectangular nozzles ( 2 ), its insulation ( 3 ) and the reheater ( 4 ), as well as the monomer extraction ( 5 ). Below you can see the blowing ( 6 ) and the filament sheet ( 7 ) in the spinning chamber ( 8 ) of the reheater ( 4 ) is indicated here. The steam is fed through a coil ( 9 ) which is passed through the heating chamber ( 10 ) of the spinning beam ( 1 ) in order to bring the already overheated steam up to the spinning temperature. Directly under the spinning beam ( 1 ), i.e. on the lower edge of the rectangular nozzle package ( 2 ) that ends with it, between the spinning beam ( 1 ) and the reheater ( 4 ), steam outlet strips ( 11 ) are attached alongside - and in the case of very wide spinning packages on both sides Each consisting of a base bar ( 12 ) and a distributor bar ( 13 ), together with the lower edge of the spinning beam ( 1 ) - a labyrinthine distributor chamber ( 14 ), which will be discussed in more detail below. The end faces of the rectangular nozzle package ( 2 ) do not need to be covered with steam in any case.

In Fig. 2, the steam outlet strips ( 11 ) for steam coating in the assembled state, ie ready for use between the spinning beam ( 1 ) and the post-heater ( 4 ) permanently mounted, shown in detail. This steam outlet strips ( 11 ) are equipped with a simple labyrinth, the distribution chamber ( 14 ), for pressure equalization. This labyrinth-like distributor chamber ( 14 ) is delimited laterally by the base bar ( 12 ) and at the top by the lower edge of the spinning beam ( 1 ) and otherwise mainly by the cutouts ( 15 , 16 ) in the distributor bar ( 13 ), a vertical distributor space ( 15 ). and a horizontal gap ( 16 ). From the coil ( 9 ), the steam inlet ( 19 ) takes place centrally in the center of the base bar ( 12 ), ie also in the center of the rectangular nozzle package ( 2 ), and opens into the relatively wide distribution chamber ( 15 ), which is open at the top and longitudinally in the Distribution strip ( 13 ). This vertical channel ( 15 ) merges into a horizontal, very narrow gap space ( 16 ) which opens into the spinning space ( 10 ). The steam then emerges from this channel ( 16 ) in the direction of the nozzle transversely to the filament sheet ( 7 ).

Fig. 3 shows a steam outlet strip ( 11 ) in the disassembled state. At the base part ( 12 ) you can see the steam inlet ( 19 ) and the end of the pipe coil ( 9 ), as well as the two fastening threads ( 17 ) for the distributor bar ( 13 ). On the distributor bar ( 13 ) you can see the screw holes ( 18 ) and the recesses ( 15 , 16 ) now open for cleaning, the vertical distributor space ( 15 ) and the narrow, horizontal gap ( 16 ), which are only in the fully installed state As already explained, form the steam equalization labyrinth ( 14 ).

The steam coating according to the invention is primarily for use in Plants designed for spinning high-strength polyamide yarns, but can be used anywhere be used wherever there is a spinning exit surface with steam cover up or create a damp spinning atmosphere. The effort must be made not just be limited to bottom loading spinning systems.

Reference list

1

Spinning beam

2nd

Rectangular nozzles

3rd

insulation

4th

Reheater

5

Monomer extraction

6

Blowing

7

Filament cluster

8th

Post-heater spinning room

4th

9

Pipe coil

10th

Boiler room of the spinning beam

1

11

Steam outlet strips

12th

Base bar; also base part

13

Distribution strip; also distribution part

14

Distribution chamber, labyrinthine; also steam equalization labyrinth

15

Distribution room, vertical; also first channel; also recess

16

Gap, horizontal; also second channel; also recess

17th

Mounting thread

18th

Screw holes

19th

Steam entry, central center

Claims (7)

1. A method and device for steam coating of rectangular nozzles and spinning systems equipped therewith for the production of polyamide filaments, in particular according to the bottom loading concept, characterized in that the water vapor required for steam coating is initially provided by a tube coil ( 9 ) lying in the heat transfer steam of the spinning beam. flows in order to be heated to almost the same temperature as the spinning temperature itself, then passed through a pressure-equalizing distribution chamber ( 14 ) before it then emerges directly on the entire long side of a rectangular nozzle package ( 2 ) and finally evenly distributed into the spinning chamber ( 8 ) reaches the spinning plate. 2. The method and device according to claim 1, characterized in that the pressure-comparing distribution chamber ( 14 ), each arranged one along the side per rectangular nozzle package ( 2 ), is configured like a labyrinth and in each case only by a single, centrally arranged steam inlet ( 19 ) from the pipe coil ( 9 ) is fed. 3. The method and device according to claims 1 and 2, characterized in that the pressure-comparative and labyrinthine designed distribution chambers ( 14 ) are arranged on both sides along the side of the rectangular nozzle package ( 2 ). 4. The method and device according to any one of the preceding claims, characterized in that the pressure-comparative and labyrinth-like designed distribution chambers ( 14 ), which follow the single and centrally arranged steam inlet ( 19 ), in their simplest form each of at least two channels ( 15 , 16 ) with a rectangular cross-section, which merge openly and at right angles into one another on their longitudinal sides, the first channel ( 15 ) having an at least two to a maximum of five times larger rectangular cross-section than the subsequent second channel ( 16 ). 5. The method and apparatus according to any one of the preceding claims, characterized in that the pressure-comparative and labyrinth-like designed distribution chambers ( 14 ), which follow the single, centrally and horizontally arranged steam inlet ( 19 ), in their simplest form each of at least two channels ( 15 , 16 ) with a rectangular cross-section, which merge openly and at right angles into one another on their long sides, the first and larger channel ( 15 ) having an upwardly open rectangular cross-section which is at right angles into a horizontal and very narrow gap space of the subsequent second channel ( 16 ) passes over, which then opens openly into the spinning chamber ( 8 ) with its long side, and through which the steam then emerges evenly distributed across the filament sheet ( 7 ) in the direction of the nozzle. 6. Device for steam coating of rectangular nozzles and spinning systems equipped therewith, characterized in that the pressure-equalizing and labyrinthine-shaped distributor chambers ( 14 ), each of which follows a single steam inlet ( 19 ), are accommodated in steam outlet strips ( 11 ), which are in their simplest form each consist of at least two strips ( 12 , 13 ) screwed together, the respective base part ( 12 ) being fixed with the central steam inlet ( 19 ) between the spinning beam ( 1 ) and the reheater ( 4 ) and the distributor part ( 13 ) in turn the base part ( 12 ) is screwed so that it can be removed for cleaning. 7. Device according to one of the preceding claims, characterized in that the pressure-comparative and labyrinthine-shaped distributor chamber ( 14 ), each of which follows a single steam inlet ( 19 ), is designed as a simple steam equalization labyrinth ( 14 ), which firstly consists of the fixed and smooth wall of the base bar ( 12 ), secondly from the fixed and smooth underside of the spinning beam ( 1 ) and thirdly and fourthly from the cutouts ( 15 , 16 ) in the mountable distributor bar ( 13 ).